Do you know that? Always have the client deposit a certain percentage of the money up-front. next

What is the difference between synchronous postback and asynchronous postback?

The difference between synchronous and asynchronous postback is as follows:

  •  Asynchronous postback renders only the part of the page which is needed; while, synchronous postback renders the entire page in a postback. 
  •  Asynchronous postback executes only one postback at a time, that is, if you have two buttons doing asynchronous postback, the actions are executed one by one; while, synchronous postback invoke all the actions at a time. 
  •  Asynchronous postback only changes the update panel that invoke the postback; while, synchronous postback changes the entire page.